Plug valve



2 Sheets-Sheet May 20', 1924.

w. LINAKER ET AL PLUG VALVE Filed April 6, 1922 Fag. 1.

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May 20 2 F. W. LINAKER ET AL PLUG VALVE Filed April 6, 1922 2 Sheets-Sheet 2 mvlzwgolz 113M) By Attorneys,

a mQ/J Q w KER and THEODORE M. BRUBACK, the former Patented May 20,1924.

UNITED STATES PATENT creme-.5 2.

rannnarcx w. LINAKER m mnononn m. BRUBAOK, or DUBOIS, rmmsvnvnnrm PLUGVALVE.

Application filed April 8,

Be it known that we, Funnnntcx W. LINA- a subject of the King of GreatBritain and the latter a citizen of the United States of America, bothresiding in Dubois in the county of Clearfield and .State oflennsylvania, have invented certain new and useful Improvements in PlugValves, of which the following is a specification. This inventionrelates to straightway valves or cocks of the plug type. As the plug ofsuch cocks, being conical. and turning in a conical seat or cavity inthe valve shell, is liable to stick fast through corrosion, the purposeof the present invention is to rovide a construction which will insure te loosening of the plug so that it may be freely turned. To this end theinvention provides a loose connection between a and the operating'imeansfor turning the plug, so that the latter has a certain play or idlemotion, and provides means for displacing the plug endwise to.. loosenit in its seat while the operating part is executing the preliminaryportion of its movement,

that is to sa during the period of such idle play. T e resultaccomplished is that upon turning the operating handle its firstmovement moves the plug endwise sufliciently to release it from anyadhesion to its seat, after which the plug is turned to l close or open.the valve.

A. construction. embodying the invention is illustrated in theaccompanying drawings, wherein- Figure 1 is in elevation, the plane ofthe section coinciding with the axis of the. inlet and outletopenings ofthe valve shell; the valve bein shown in the position occupied in,themiddle of the preliminary movement;

Fig. 2 is a similar section. showing the valve with the parts in theposition occupied when the valve is closed;

Fig. 3 is'a horizontal-section in the plane L of the line 3-3 in'Fig. 1,showing the parts in the same position as in Fig. 1;

' Fig. 4 is a horizontal section in the plane of the line H in Fig. 2,showing the parts in the same position as in Fig. 2; I

. Fig. 5 is a vertical mi ectlon ina-plane at right angles to that ofig. 1; Fig. 6 1s a horizontal 6-6 inFig. 5..

a I vertical mid-section, partly top 1922. Serial 1T0. 560,128.

The invention is shown as applied to a plug valve or cock which in themain is of the ordinary construction, comprising a valve shell or casinghaving inlet and outlet openings for connecting with the pipe, and.between them a conical lug chamber in which is mounted a rotatable plug,and with an 0 rating stem passing out from the shell t rough a stuflingbox and termiiir the plug chamber by means of a spring 0 acting againstits larger end andreacting against a cover or cap 0 which is fastened tothe valve in any suitable way, with intervening packing or' otherprovision for making a tight joint. In line withthe plug is a valve stemD, passing out through a stufiing box E, or any means for preventinleakage, and having fixed on its outer end an operating part or handleF. The inner end of the stem has an enlargement or head D which is,received in a chamber (1 within the shell, and above this chamber theshell is formed with an u wardly-projecting oke A within whi is locatedthe glan G of the stufiing box, the projecting ends ,of this yoke, beingfastened down by any suitable construction, such as the screws shown atH in Fig. 5.

At some suitable polnt between the operating element or. handle F andthe plug B,

there is introduced a loose connection per mitting the handle to movethrough. a suitable angular distance before beginning to turn the pluThis preliminary motionis 109 itilized to. glve endwise displacement,to. the

plug for overcoming anygadhesion. to. its. In the constructionshown,"theloosel,; connection is attained by -=forming; in. the

of the plug a. recess-.e, and formin' .on 105 seat.

the under side ofthe headDi a projection f, which are so proportioned toeachother ;---as to give the. rojection..a;-certainplay in=. otion onthe line the recess, as s own in F ig. 4. Obviousl the recess andprojection'could be reversal or any other arrangement afiording therequisite lost motion could be substituted.

For imparting the endwise thrust to the plug during this preliminarymovement, that is, during the period of lost or idle motion, it ispreferable to provide a pair of toggle pins arranged in the manner shownin Figs. 1 to 5, inclusive. For this-purpose the under side of the headD and the upper side of the plug B are formed with recesses g and hrespectively, which recesses coincide with one another at the middle ofthe idle movement; and in these recesses are placed the toggle pins J,J, as clearly shown in Fig. 5. Before the beginning of the idle movementeach recess-is out of coincidence with its mating recess, so.that thetoggle pins stand in an oblique position, as clearly shown in Fig. 2;during the idle movement the head D by its rotative movement carries theupper ends of the pins to points over their lower ends, thereby bringingthe pins to vertical position, as shown in Fig. 1, and by reason of thistoggle movement exerting a powerful downward thrust upon the plug, theextent of which thrust is sufiicient to forcibly loosen the plug fromany adhesion to its seat. As the idle movement continues, the pins arecarried to an oblique position opposite to their original position, atwhich time, the lost motion having been taken up, the projection fengages the walls of the recess 6, and the further movement of theoperating handle rotates the plug.

The plug should be turned about 90 between its open and closedpositions, and it is desirable to introduce any usual stops for limitingits movement, which in the construction shown are formed by means of a90 arc-shaped rib. i projecting upwardly from the cover G into a 180arc-shaped groove j formed in the under side of the plug B, these partsbeing bestshown in i 5 and 6.

t'is essential to the toggle operation that the lower end of anadjustable bushing m' preferably screw-threaded into the yoke A and setin its adjusted position by meansof a set-screw p. This adjustmentenables the parts to be'brought into correctv relation to insure thecorrect operation of the tog 1e ins when the valve is first assems blehe valve stem and I its head are held from downward displacement by anannular portion g onthe handle F seating against the; finished upperface of ,the yoke A.

'When the valve is in either open or closed.

position the projection f rests against one side of the recess e, asshown in Fig. 4. operation, the first part of the movement of the handleturns the stem and its head D without turning the plug, this movementcarrying the pin J from its oblique position to one side of the center,to a like oblique position on the opposite side, and during thismovement the straightening of the pins causes a heavy downward thrust tobe imparted to the plug, so that the latter is unseated at the time whenthe toggle pins are passing the vertical position. When this firstmovement is completed, the projection f strikes the opposite side of therecess e, and the further turning movement of the handle forcibly turnsthe plug, which now turns easily because pf its having been loosenedfrom its adherence to the conical seat.

Thus the movement of the handle is in excess of the movement of the plugto the extent of the preliminary idle movement provided.

The construction of plug valve provided by the presentinvention hasimportant advantages overthe constructions of such valves cally at thebeginning of each turning movement of the valve. The end of eachmovement leaves the parts in position for first loosening the plug andafterward turning it on the next turning eflort. If the valve is onlypartly open, the same operation takes place as if the valve were whollyopened or closed; that is to say, the first portion of each angular orturning movement loosens the plug before beginning to turn it. It isunderstood that the invention is not confined to the preciseconstruction shown, as any equivalent construction within the scope ofthe claims will be within the invention.

We claim as our invention:

1. A plug valve comprising a plug and its operating means, having alooseconnection afi'ording idle play, with toggle means operative during suchplay to force the plug endwise. A

2. A'plug valve comprising a plug and its operating means, having aloose connection afi'ording idle play, with toggle pins having theirends seated in recesses relatively movable during such play, lwhereby toforce the plug end 3. A plug valve comprising a casing havstraighteningof the pins an endwise dising a conical seat, a plug turning in saidplacement to the plug to loosen it in its seat. seat, a valve stemhaving a head, the plug In witness whereof, we have hereunto andhead'having opposed recesses, and toggle signed our names.

I pins having their ends seated in said respective recesses and adapcedupon a turning FREDERICK W. LINAKER. movement of fine head tocommunicate by the THEODORE M. BRUBACK

